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Re: Why does a dirty air filter cause elevated CO emissions?
Posted to Technical Theory Forum on 12/2/2018 3 Replies

I'll try and reply to everyone here as best I can. The car's not by me anymore, but I recorded some PIDs before and after changing the air filter. Also the before and after tailpipe emissions numbers in the OP were both taken at about 2700 rpm.

Dirty filter ... Login to read more.

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